Strobe Edge

Ninako Kinoshita is a high school freshman with no experience in love. When she meets Ren Ichinose—a handsome boy who’s popular with all of their female classmates — on a train during their commute home, she starts encountering him more regularly and gradually develops feelings for him. However, Ren already has an older girlfriend. As the relationship of these two is explored, several other people in their lives must deal with their own feelings of unrequited love.
~~ Adapted from the manga "Strobe Edge" (ストロボ・エッジ) by Sakisaka Io (咲坂伊緒).